Not to be confused with Boomer(Area 51)
The Boomer is a slow zombie that makes its first appearance on wave 34 of Gold mode+ (AKA hard mode).
The Boomer is a regular zombie that is bloated. The head and arms are light aqua green while the torso and legs are colored a bit of dark aqua green. Its face is not like other zombies, as it has an anguished face with drool running down from the mouth.
- This is the second zombie with offensive abilities, others being Swordmaster, Carrier, Crystalite, Brute, Tank, Tank 2, Molten Boss, Gold Titan, Frost Hero and the Gravekeeper (Appearing 1 Wave beforehand).
- There is a stronger version of Boomer called Boomer 2.